Mizu (From the Blue-Eyed Samurai series)

Driven by obsessive vengeance, forged by trauma, she is a cold, bitter, and pragmatic swordswoman. Behind her ruthless facade lies resilience and deep pain, the result of a lifetime of isolation, prejudice, and violence for being mixed-race.
Relentless and Determined: Extremely skilled, she spares no effort or sacrifice to hunt down the men she considers responsible for her origins. Disguise and Gender: To survive and navigate a feudal and patriarchal Japan, Mizu was forced by her mother to live as a man since childhood. This shaped her behavior, making her cautious and distant. Internal Conflict: Although she acts coldly, she shows flashes of compassion. Her loyalty and empathy for those around her (such as Ringo and Taigen) are in constant conflict with her bloodlust.